diff --git a/map_machine/__main__.py b/map_machine/__main__.py
index 875346d..a0f6d29 100644
--- a/map_machine/__main__.py
+++ b/map_machine/__main__.py
@@ -3,5 +3,8 @@ Map Machine entry point.
 """
 from map_machine.main import main
 
+__author__ = "Sergey Vartanov"
+__email__ = "me@enzet.ru"
+
 if __name__ == "__main__":
     main()
diff --git a/map_machine/constructor.py b/map_machine/constructor.py
index 47a7723..0155b16 100644
--- a/map_machine/constructor.py
+++ b/map_machine/constructor.py
@@ -20,20 +20,21 @@ from map_machine.figure import (
     Tree,
 )
 from map_machine.flinger import Flinger
-from map_machine.map_configuration import DrawingMode, MapConfiguration
-
-# fmt: off
 from map_machine.icon import (
-    DEFAULT_SMALL_SHAPE_ID, Icon, IconSet, Shape, ShapeExtractor,
-    ShapeSpecification
+    DEFAULT_SMALL_SHAPE_ID,
+    Icon,
+    IconSet,
+    Shape,
+    ShapeExtractor,
+    ShapeSpecification,
 )
+from map_machine.map_configuration import DrawingMode, MapConfiguration
 from map_machine.osm_reader import OSMData, OSMNode, OSMRelation, OSMWay
 from map_machine.point import Point
 from map_machine.scheme import DEFAULT_COLOR, LineStyle, RoadMatcher, Scheme
 from map_machine.text import Label
 from map_machine.ui import BuildingMode
 from map_machine.util import MinMax
-# fmt: on
 
 __author__ = "Sergey Vartanov"
 __email__ = "me@enzet.ru"
diff --git a/map_machine/main.py b/map_machine/main.py
index 7e7993f..a99dcda 100644
--- a/map_machine/main.py
+++ b/map_machine/main.py
@@ -21,7 +21,7 @@ def main() -> None:
     arguments: argparse.Namespace = parse_options(sys.argv)
 
     if not arguments.command:
-        print("No command provided. See --help.")
+        logging.fatal("No command provided. See --help.")
 
     elif arguments.command == "render":
         from map_machine import mapper
diff --git a/tests/test_osm_reader.py b/tests/test_osm_reader.py
index 276cb55..6b8d583 100644
--- a/tests/test_osm_reader.py
+++ b/tests/test_osm_reader.py
@@ -4,11 +4,11 @@ Test OSM XML parsing.
 import numpy as np
 
 from map_machine.osm_reader import (
+    OSMData,
     OSMNode,
     OSMReader,
     OSMRelation,
     OSMWay,
-    OSMData,
 )
 
 __author__ = "Sergey Vartanov"
diff --git a/tests/test_zoom_level.py b/tests/test_zoom_level.py
index f4b3428..d0a1584 100644
--- a/tests/test_zoom_level.py
+++ b/tests/test_zoom_level.py
@@ -3,6 +3,9 @@ Test zoom level specification parsing.
 """
 from map_machine.tile import ScaleConfigurationException, parse_zoom_level
 
+__author__ = "Sergey Vartanov"
+__email__ = "me@enzet.ru"
+
 
 def test_zoom_level_1() -> None:
     """Test one zoom level."""